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CVE-2026-59885

CVE-2026-59885 · pyasn1: Quadratic complexity in OBJECT IDENTIFIER and RELATIVE-OID processing allows denial of service

This page contains facts from public vulnerability sources. Check the original advisory before updating.

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.

CVSS 7.5 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • pyasn1

    Versions
    • < 0.6.4: Affected

    No fix published

  • pyasn1 Debian:12

    Versions
    • 0.4.8-3
    • 0.4.8-3+deb12u1
    • 0.4.8-3+deb12u2
    Affected ranges
    • ECOSYSTEM: < 0.4.8-3+deb12u3

    Update to 0.4.8-3+deb12u3

  • pyasn1 Debian:13

    Versions
    • 0.6.1-1
    • 0.6.1-1+deb13u1
    • 0.6.1-1+deb13u2
    Affected ranges
    • ECOSYSTEM: < 0.6.1-1+deb13u3

    Update to 0.6.1-1+deb13u3

  • pyasn1 Debian:14

    Versions
    • 0.6.1-1
    • 0.6.2-1
    • 0.6.2-1~bpo13+1
    • 0.6.3-1
    • 0.6.4-1~bpo13+1
    Affected ranges
    • ECOSYSTEM: < 0.6.4-1

    Update to 0.6.4-1

  • pyasn1 PyPI

    Versions
    • 0.0.10a
    • 0.0.11a
    • 0.0.12a
    • 0.0.13
    • 0.0.13a
    • 0.0.13b
    • 0.0.6a
    • 0.0.9a
    • 0.1.1
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.5
    • 0.1.6
    • 0.1.7
    • 0.1.8
    • 0.1.9
    • 0.2.1
    • 0.2.2
    • 0.2.3
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.3.5
    • 0.3.6
    • 0.3.7
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.4.4
    • 0.4.5
    • 0.4.6
    • 0.4.7
    • 0.4.8
    • 0.5.0
    • 0.5.1
    • 0.6.0
    • 0.6.1
    • 0.6.2
    • 0.6.3
    Affected ranges
    • ECOSYSTEM: < 0.6.4

    Update to 0.6.4

  • pyasn1 Ubuntu:Pro:14.04:LTS

    Versions
    • 0.1.4-0ubuntu1
    • 0.1.7-1ubuntu1
    • 0.1.7-1ubuntu2
    • 0.1.7-1ubuntu2.1
    • 0.1.7-1ubuntu2.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:Pro:16.04:LTS

    Versions
    • 0.1.8-2
    • 0.1.9-1
    • 0.1.9-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:Pro:18.04:LTS

    Versions
    • 0.1.9-2
    • 0.4.2-3
    • 0.4.2-3ubuntu0.18.04.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:Pro:20.04:LTS

    Versions
    • 0.4.2-3
    • 0.4.2-3build1
    • 0.4.2-3ubuntu0.20.04.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:22.04:LTS

    Versions
    • 0.4.8-1
    • 0.4.8-1ubuntu0.1
    • 0.4.8-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 0.4.8-1ubuntu0.3

    Update to 0.4.8-1ubuntu0.3

  • pyasn1 Ubuntu:24.04:LTS

    Versions
    • 0.4.8-4
    • 0.4.8-4ubuntu0.1
    • 0.4.8-4ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 0.4.8-4ubuntu0.3

    Update to 0.4.8-4ubuntu0.3

  • pyasn1 Ubuntu:26.04:LTS

    Versions
    • 0.6.1-1
    • 0.6.1-1build1
    • 0.6.2-1
    • 0.6.3-1
    Affected ranges
    • ECOSYSTEM: < 0.6.3-1ubuntu0.1

    Update to 0.6.3-1ubuntu0.1

Original sources

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